Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....36...17g&link_type=abstract
Astronomy and Astrophysics, vol. 36, no. 1, Nov. 1974, p. 17-25. Research sponsored by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astrophysics
22
Atmospheric Turbulence, Line Spectra, Photosphere, Solar Spectra, Velocity Distribution, Abundance, Correlation, Oxygen Spectra, Solar Atmosphere, Spectral Line Width, Stochastic Processes
Scientific paper
The concept of stochastic turbulent fields is applied to line formation in the solar photosphere. The effect of a finite correlation length on the line profiles, the equivalent widths and the curves of growth is discussed. It is shown that for a correlation length which is smaller than the photospheric scale height both the line center and the outer wings of a line are formed approximately under microturbulent conditions. A comparison of the calculations with the observed profiles for the O I lines at 7771, 7774, and 7775 A and for the Fe I lines at 5576, 5934, and 6200 A gives correlation lengths of the order of 100-300 km and mean turbulent velocities of about 2 km/s. For the iron lines the analysis yields abundances which are smaller than the values obtained by previous authors.
Gail Hans-Peter
Sedlmayr Erwin
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